Last reviewed on 10-02-2020

Documentation of California's Greenhouse Gas Inventory (13th Edition - Last updated on 10-15-2020)

♦ Category: Energy

IPCC: 1A4a - Fuel Combustion Activities - Other Sectors - Commercial/Institutional
Sector: Commercial : Domestic Utilities : Sewerage Systems

♦ Activity: Fuel combustion - Natural gas

♦ Greenhouse gas: Carbon dioxide ( CO2 )

► Year 2005 —

● Greenhouse gas emission estimate —

Amount: 2.86 tonnes of CO2 Emitted (2.86 tonnes CO2 Eq.)
Basis: Calculation
Calculation: [Fuel combustion] * [Heat content] * [Fuel CO2 emission]
Reference: IPCC (2006). 2006 IPCC Guidelines for National Greenhouse Gas Inventories, Prepared by the National Greenhouse Gas Inventories Programme, Eggleston H.S., Buendia L., Miwa K., Ngara T., and Tanabe K. (eds). Volume 2, Chapter 2: Stationary Combustion. Published: IGES, Japan.

● Activity level used in calculations —

Activity: Fuel combustion = 52,693 scf of Natural gas
Basis: Data
Reference: Nguyen, C. (2019). Data request (data from the CEC's Quarterly Fuels and Energy Report) between CARB and Cam-Giang Nguyen of the California Energy Commission. February 2019.

● Parameters and Constants used in calculations —

Parameter: Fuel CO2 emission = 0.053 g / btu
Reference: ARB Mandatory Reporting of Greenhouse Gas Regulation. Subpart C of 40 CFR Part 98 (98.30 to 98.38). Available online at:
Parameter: Heat content = 1,023 btu / scf
Reference: EIA (2019). Energy Information Administration. State Energy Consumption, Price, and Expenditure Estimates (SEDS). Available online at:

● Greenhouse gas emitted per unit activity (derived from values listed above) —

Amount: 54.2 g of CO2 per scf of Natural gas